A 13-year-old girl was injured when a bullet struck the SUV in which she was riding Saturday. It was one of four vehicles fired upon on Interstate 10 in Phoenix over the past four days. (The Arizona Department of Public Safety via AP)

(Newser)
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"You should be concerned," a spokesperson for the Arizona Department of Public Safety said during a press conference yesterday. "It has not ended in tragedy, but it could." The AP reports four vehicles have been struck by bullets while traveling along an 8-mile stretch of Interstate 10 in Phoenix, with a 13-year-old girl being the sole injury so far. According to ABC 15, the shootings took place between Saturday morning and yesterday morning, and no suspects or motives have been identified. "We've had bullets hit the sides of the cars; we've had bullets hit windshields," says the DPS spokesperson.

Since Saturday, bullets have struck an SUV's window, the headlight of a work truck, and the passenger sides of a tour bus and another vehicle, DPS states in a press release. ABC reports that a 13-year-old girl was cut on the ear when a bullet pierced the SUV, with photos showing a bullet hole in the passenger-side window. At the moment, the shootings appear to be random, and drivers are being warned to stay vigilant. The AP reports police are looking for witnesses and trying to figure out if the same person is responsible for all four shootings.